Method for absorption treatment of noxious exhaust gas by electrochemistry method

Abstract

The invention relates to a method for absorbing and treating harmful waste gases by an electrochemical process. Gases containing the harmful waste gases to be treated are led into an adsorption tower; wherein, the harmful gases are absorbed by absorption liquid and become a resulting absorbent product. The purified gas is discharged from a gas discharging port. The absorption liquid containing the resulting absorbent product enters into an electrochemistry reactor. The resulting absorbent product are reacted chemically in the electrochemistry reactor and converted into materials with the chemical stability so that the absorption liquid is regenerated. The absorption liquid is of acid aqueous solution or acid and salt blending aqueous solution. The method causes that the electrochemistry oxidation reaction is carried out on the absorbed noxious substance in the sour environment; the reaction velocity is greatly increased. The method is especially suitable for the reaction absorption treatment of harmful waste gases such as hydrocarbon with bad water-solubility, organic matters containing halogen, sulfur or nitrogen elements, waste gas in a sewage plant and ammonia, etc.

Description

(1) Technical field [0001] The invention relates to a method for electrochemically absorbing and treating harmful waste gas. (2) Background technology [0002] Various organic gaseous pollutants such as hydrocarbons, alcohols, ethers, aldehydes, phenols, ketones, carboxylic acids, esters, nitriles, amines and heterocyclic compounds, etc., sulfur dioxide, hydrogen sulfide, nitrogen oxides, carbon disulfide, nitrogen trifluoride, sulfide Inorganic pollutants such as hydrogen, hydrogen cyanide, and ammonia are widely produced in industrial production processes such as chemical industry, pharmaceuticals, and coatings. Most of these volatile organic compounds are poisonous, and some are foul-smelling gases. After being discharged into the atmosphere, they will affect the ecological environment and harm the human body. healthy. However, since these organic substances have stable chemical structures and are not easy to degrade, they bring great difficulties to environmental protec...

AI Technical Summary

Problems solved by technology

This invention proposes a method for purifying harmful waste gas. The gas containing harmful gas of alcohol, ether, aldehyde, phenol, ketone or ester organic matter to be treated is introduced into the absorption tower, and the harmful gas is absorbed by the absorption liquid and then enters the electrocatalytic oxidation reactor. , the electrocatalytic oxidation reaction is carried out on the absorption liquid in the electrocatalytic oxidation reactor, the absorption product is further oxidized and converted into a chemically stable substance, the absorption liquid is regenerated, the absorption capacity is restored, and the treated gas is purified; the absorption The liquid is recycled; the absorption liquid of the absorption tower adopts alkaline solution sodium hydroxide solution or potassium hydroxide solution, and the mass percentage concentration is 0.5-30%. The effect of organic matter such as ester organic matter is better, but the effect is poor when dealing with hydrocarbons with more stable chemical structure (including aromatic hydrocarbons), organic matter or heterocyclic organic compounds containing halogen or sulfur or nitrogen elements, or inorganic substances such as ammonia. Improve the formulation of the absorption liquid to achieve high removal efficiency for these harmful substances, and the industrial application is more valuable

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